package routines.system;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.dom4j.Element;
import org.dom4j.Namespace;

/**
 * dom4j Document helper
 * @author Administrator
 *
 */
public class DocumentHelper {
	

	/**
	 * 
	 * @param element : current element
	 * @return the path of current element
	 */
	public	static String getPath(Element element,Map<String,String> defaultNamespaceUriTOPrefix) {
		Element parent = element.getParent();
		
		if (parent == null) {
            return "/" + getXPathNameStep(element,defaultNamespaceUriTOPrefix);
        }
		
		return getPath(parent,defaultNamespaceUriTOPrefix) + "/" + getXPathNameStep(element,defaultNamespaceUriTOPrefix);
	}
	
	
	private	static String getXPathNameStep(Element element,Map<String,String> defaultNamespaceUriTOPrefix) {
		String uri = element.getNamespaceURI();

        if ((uri == null) || (uri.length() == 0)) {
            return element.getName();
        }

        String prefix = element.getNamespacePrefix();

        if ((prefix == null) || (prefix.length() == 0)) {
        	String defaultNamespacePrefix = defaultNamespaceUriTOPrefix.get(uri);
            return defaultNamespacePrefix + ":" + element.getName();
        }

        return element.getQName().getQualifiedName();
	}
	
	/**
	 * compare DOM NODE
	 * @return  true when path is the same && all the node namespaces are the same in the path && the declared namespace of the current node is the same
	 */
	public static boolean compareNodes(String path,Element element,Map<String,String> defaultNamespaceUriTOPrefix, Map<String,String> declaredNamespacesMapping,boolean appendDoc) {
		boolean samePath = path.equals(getPath(element,defaultNamespaceUriTOPrefix));
		
		if(!samePath) {
			return false;
		}
		
		if(appendDoc) {
			List<Namespace> declaredNamespaces = element.declaredNamespaces();
			int size = declaredNamespaces.size();
			if(size == 0) {
				return declaredNamespacesMapping == null || declaredNamespacesMapping.size() == 0;
			} else if(size == 1) {
				if(declaredNamespacesMapping!=null && declaredNamespacesMapping.size() == 1) {
					Namespace namespace = declaredNamespaces.get(0);
					for(Map.Entry<String, String> entry : declaredNamespacesMapping.entrySet()) {
						return namespace.getPrefix().equals(entry.getKey()) && namespace.getURI().equals(entry.getValue());
					}
				} else {
					return false;
				}
			} else {//a few case : two or more declared namespaces
				if(declaredNamespacesMapping!=null && declaredNamespacesMapping.size() == size) {
					Map<String,String> namespaces = new HashMap<String,String>();
					for(Namespace namespace : declaredNamespaces) {
						namespaces.put(namespace.getPrefix(), namespace.getURI());
					}
					return (namespaces.hashCode() == declaredNamespacesMapping.hashCode()) && namespaces.equals(declaredNamespacesMapping);
				} else {
					return false;
				}
			}
		}
		
		return true;
	}
	
	/**
	 * for the xml append and check whether the root element is the same
	 * @param root
	 * @param prefixToUri
	 * @return
	 */
	public static boolean isMatchAtRoot(Element root,Map<String,String> prefixToUri) {
		if(root == null) {
			return false;
		}
		Namespace namespace = root.getNamespace();
		String uri = namespace.getURI();
		if("".equals(namespace.getPrefix()) && !"".equals(uri)) {
			for(Map.Entry<String, String> entry : prefixToUri.entrySet()) {
				if(uri.equals(entry.getValue()) && entry.getKey()!=null && entry.getKey().startsWith("TPrefix")) {//TPrefix mean that default namespace in UI tree
					return true;
				}
			}
			return false;
		}
		return true;
	}
	
}
